Type-writer platen.



UNITED STATES Patented March 28, 1905.

PATENT OFFICE.

TYPE-WRITER PLATEN.

SPECIFICATION forming part of Letters Patent No. 786,067, dated March 28, 1905.

Application filed March 19, 1904:. Serial No. 199,002.

To a whom, it may concern.-

Be it known that I, CHARLEs HENRY STUART, a citizen of the United States, and a resident of Newark, in the county of Wayne and State of New York, have invented a new and Improved Typeriter Platen, of which the following is a full, clear, and exact description.

My invention relates to type-writer platens.

The objects of my invention are to provide a type-writer platen or roll which shall permit the type to strike the surface thereof at different points, and thereby increase the durability of the platen. Ordinarily in type-writers the periods and other characters strike continuously on the same series of points on the platen and gradually form depressions in the surface of great depth, which necessitates the frequent renewal of the platen and keeps it constantly in a roughened condition.

The object of my invention, as stated above, is to avoid this condition by causing the type to strike the platen at difierent points each time the same part of the surface comes to the writing position.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference inclicate corresponding parts in all the figures.

Figures 1 and 2 are side views of a typewriter platen, showing two constructions thereof. Fig. 3 is a longitudinal sectional view of the form shown in Fig. 2 on the line 3 3 of Fig. 1. Fig. 4: is an end view, and Fig. 5 is a transverse sectional View on the line 5 5 of Fig. 3.

1 represents a core for the platen, which may be constructed of wood or other desired material. It is provided with the usual metallic end pieces 2, ratchets 3, and means for attaching it to the shaft. The rubber covering 4 is made loose on the wooden core 1 and is preferably made slightly larger than the core, as clearly shown in Fig. 5. It is also, if desired, made shorter than the space be tween the end pieces 2. This construction permits the rubber covering 1 to easily slip upon the wooden core, and as the tension-fingers that guide the paper hold it down upon the wooden core while the line is written it will be seen that on account of having a bore larger than the wooden core the covering will travel Very slightly with respect to the core,

and thereby prevent the characters striking 'in exactly the same place upon the covering when one revolution of the core has been made. The covering may also slide longitudinally in the construction shown in Figs. 2 and 3 for the same purpose.

Aside from the automatic motion described the covering can be moved by hand either circumferentially or longitudinally in an obvious manner.

Fig. 1 shows another form in which the covering 5 occupies the entire length between the end pieces 2. In this form longitudinal motion of the covering is also possible and the circumferential motion is the same as in the form before described. In this form the rubber covering can be shifted longitudinally by any desired means.

In Figs. 3, 4C, and 5 I have also shown a thin and preferably soft rubber tube 6 slipped over the platen. This tube is intend ed to take the place of the backing sheet frequently used on type-writers, and as it will be inexpensive may be thrown away and replaced when worn out. It may be made to travel on the platen, as above described.

Having thusdescribed my invention, I claim as new and desire to secure by Letters Patent 1. A type-writer platen provided with a core and a loose covering, the core being arranged to roll on the inside surface of the covering, and being shorter than the core to allow it to slide longitudinally thereon.

2. A type-writer platen provided with a core and a loose covering, the core being arranged to roll on the inside surface of the covering, and the covering being capable of longitudinal adjustment on the core to allow the type to strike longitudinally indifferent places on the platen.

3. A type-writer platen having a wooden core, a flexible covering shiftable relatively to the core, and a removable rubber backing sheet upon said covering.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES HENRY S"UART.

Witnesses:

ARTHUR CHRIs'rY, J r., l/VILsoN M. GOULD. 

